没有人能肯定地说，这声音是从他的脑袋里发出来的呢，还是从空树里发出来的呢？
Whether the sound came from his head or from the hollow tree, that no one could say with certainty.
空树的汇总是零，其他树的汇总是左树加上Integer的值再加上右树的值。
The sum of an empty tree is zero, and the sum of other trees is the sum of the left tree plus the value of the Integer plus the sum of the right tree.
在地球上的许多地方，生长缓慢的古树森林已被砍伐一空，以供人类使用。
Across much of the planet, forests of slow-growing ancient trees have been cleared for human use.
工厂附近的街道散发着啤酒味，到处都是啤酒和其他饮料的空瓶和空罐子：有的在铁轨上，有的卡在树里，有的漂在附近的河里。
The streets around the factory smelled like beer, with empty bottles and cans of beer and other beverages everywhere: on railroad tracks, stuck in trees and floating in the nearby river.
该方法返回一个尚未连接到文档树中任何位置的空节点。
This method returns an empty node that is not linked anywhere in the document tree yet.
有几条从空而来的树根沿着树身爬下来，在树的底座绕成一个盘根错节的黑圈。
Some of its aerial roots, creeping down along its trunk, had formed a dark complication of coils at its base.
利用或空元素，每个项目必须指定自己用来更新源树的版本控制工具。
Using either the or empty element, each project must specify the version-control tool that should be used to update its source tree.
编辑器会打开一个空类型树，并且您会在页面底部看到ExtenderProperties视图，其中将显示特定数据类型的属性。
An empty type tree will open up in the editor and at the bottom of the page, you will see the Extender properties view, which shows the properties of a particular data type.
空列表前面的单引号用来告诉scheme您正在使用作为数据，而不是用它作为解析树的一部分。
The single quotation mark in front of the null list is used to tell Scheme that you are using as data and not as a part of your parse tree.
在type树编辑面板中双击rec，调出一个空的组件面板。
On the Type tree edit panel, double-click on rec, which brings up an empty component panel.
针对沙盐三井、沙盐四井的首采层修复后，在多次安装采卤树试采卤的过程中，均造成井下中心管堵管或环空堵塞。
After the No. 3 and No. 4 Shayang brine wells repaired, the center pipe had been blocked in the process of brine mining.
针对沙盐三井、沙盐四井的首采层修复后，在多次安装采卤树试采卤的过程中，均造成井下中心管堵管或环空堵塞。
After the No. 3 and No. 4 Shayang brine wells repaired, the center pipe had been blocked in the process of brine mining.
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